Tehran also increasingly cut back its cooperation with the International Atomic Energy Agency, the U.N.'s nuclear watchdog, as tensions increased over its nuclear program in recent years. The IAEA’s director-general has warned Iran could build as many as 10 nuclear bombs, should it decide to weaponize its program.

At least 16 people have been killed during a week of unrest in Iran, rights groups said on Sunday, as protests over soaring inflation spread across the country, sparking violent clashes between demonstrators and security forces.

Anti-regime protests entered a fifth day as demonstrations spread across Tehran and other cities, with reports of deaths emerging amid escalating nationwide unrest.

The deaths may mark the start of a heavier-handed response by Iran's theocracy over the demonstrations, which have slowed in Tehran but expanded elsewhere.

Galloping inflation and a currency crisis have provoked demonstrations across the country. Protests fueled by deepening economic hardship have swept Iran for more than a week, as soaring inflation has driven frustrated traders and university students into the streets of major cities, including the capital, Tehran.

Iran is experiencing a countrywide shutdown triggered by intensifying protests and a deepening political and economic crisis. This government-ordered shutdown has impacted businesses, educational institutions,

As the U.S. and Israel back Iranians' right to protest against their leaders, authorities in Tehran detain students and declare a sudden holiday.

Both the semi-official Fars news agency and human rights group, Hengaw, said two people had died during clashes between protesters and security forces in the city of Lordegan, in south-western Iran. Three more people were killed in Azna and another in Kouhdasht, Fars reported, all in the west of the country.